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Development of Nox Storage-Reduction 3-Way Catalyst for D-4 Engines
Published October 20, 1998 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Autumn Conference
Reduction of fuel consumption is the task in vehicles. D-4 engines are effective in reducing fuel consumption, but purification of NOx has been impossible with conventional catalyst. New NOx storage-reduction 3-way catalyst was put into practical use in 1996 for the vehicles with D-4 engines. This catalyst, however, is poisoned by SO2, thus its activity is reduced. We have, therefore, analyzed the sulfur-desorption phenomenon, and succeed in improving the catalyst performance by improving the monolithic substrate and the additional material.